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Astron. Astrophys. 356, 141-145 (2000)

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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars *

C. Fabricius and V.V. Makarov

Copenhagen University Observatory, Juliane Maries Vej 30, 2100 Copenhagen O, Denmark

Received 22 October 1999 / Accepted 25 January 2000


Using observations obtained with the Tycho instrument of the ESA Hipparcos satellite, a two-colour photometry is produced for components of more than [FORMULA] Hipparcos double and multiple stars with angular separations 0.1 to 2.5 arcsec. We publish 9473 components of 5173 systems with separations above 0.3 arcsec. The majority of them did not have Tycho photometry in the Hipparcos catalogue. The magnitudes are derived in the Tycho [FORMULA] and [FORMULA] passbands, similar to the Johnson passbands. Photometrically resolved components of the binaries with statistically significant trigonometric parallaxes can be put on an HR diagram, the majority of them for the first time.

Key words: stars: binaries: visual – stars: Hertzsprung – Russel (HR) and C-M diagrams – techniques: photometric

* Based on observations made with the ESA Hipparcos satellite.

Send offprint requests to: makarov@astro.ku.dk

© European Southern Observatory (ESO) 2000

Online publication: March 28, 2000